Synthesis of Environmentally Friendly Activated Alkali Concrete (Geopolymer) Based on Bentonite

Journal of Environmental Friendly Materials

مقاله 2، دوره 6، شماره 2 - شماره پیاپی 12، اسفند 2022، صفحه 1-8   

نوع مقاله: Original Article

نویسنده

A Esparham

Department of Environmental Engineering, University of Tehran, Tehran, Iran

چکیده

Geopolymers can be mentioned as a new class of green cement adhesives. Geopolymers have recently been introduced as a greener alternative to conventional Portland cement (OPC) with the potential to minimize the negative environmental consequences of OPC such as carbon footprint and energy consumption. In this experimental study, the effects of different alkaline activating solutions on compressive, tensile, and indirect flexural strength, water absorption, and acid resistance of bentonite-based geopolymer concrete (GPC) were investigated. Also in this study, a new type of alkaline activator was used. In this study, GPC samples made from bentonite were produced and baked at 90 ° C.  The results showed that the addition of NaOH to the mixture after 3 minutes of mixing KOH and Na₂SiO₃ with dry components (1/3 of the total mixing time) increases the compressive, tensile, and flexural strength and we also see that with this new method, water absorption capacity and the amount of weight loss of geopolymer concrete samples are reduced in acidic conditions.

کلیدواژه‌ها

Eco-Friendly Cement؛ Geopolymer Concrete؛ Bentonite؛ Mechanical Strength؛ Alkaline Solution؛ Compressive Strength؛ Acid Resistance